<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="addRoleDialogVisible = true">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="rolelist" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row
              :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <el-row
                  :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']"
                  v-for="(item2, i2) in item1.children"
                  :key="item2.id"
                >
                  <el-col :span="6">
                    <el-tag
                      closable
                      type="success"
                      @close="removeRightById(scope.row, item2.id)"
                    >{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag
                      closable
                      type="warning"
                      v-for="(item3) in item2.children"
                      :key="item3.id"
                      @close="removeRightById(scope.row, item3.id)"
                    >{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作">
          <template slot-scope="scope">
            <el-button
              size="mini"
              type="primary"
              icon="el-icon-edit"
              @click="showEditRoleDialog(scope.row.id)"
            >编辑</el-button>
            <el-button
              size="mini"
              type="danger"
              icon="el-icon-delete"
              @click="removeRoleById(scope.row.id)"
            >删除</el-button>
            <el-button
              size="mini"
              type="warning"
              icon="el-icon-setting"
              @click="showSetRightDialog(scope.row)"
            >分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
      <!-- 添加角色操作对话框 -->
      <el-dialog
        title="添加角色"
        :visible.sync="addRoleDialogVisible"
        width="50%"
        @close="addRoleDialogClosed"
      >
        <!-- 内容主体区域 -->
        <el-form
          :model="addRoleForm"
          :rules="addRoleFormRules"
          ref="addRoleFormRef"
          label-width="80px"
        >
          <el-form-item label="角色名称" prop="roleName">
            <el-input v-model="addRoleForm.roleName"></el-input>
          </el-form-item>
          <el-form-item label="角色描述" prop="roleDesc">
            <el-input v-model="addRoleForm.roleDesc"></el-input>
          </el-form-item>
        </el-form>
        <!-- 底部区域 -->
        <span slot="footer" class="dialog-footer">
          <el-button @click="addRoleDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="addRole">确 定</el-button>
        </span>
      </el-dialog>
      <!-- 修改角色操作的对话框 -->
      <el-dialog
        title="修改用户角色"
        :visible.sync="editRoleDialogVisible"
        width="50%"
        @close="editRoleDialogClosed"
      >
        <el-form
          :model="editRoleForm"
          :rules="editRoleFormRules"
          ref="editRoleFormRef"
          label-width="80px"
        >
          <el-form-item label="角色名称" prop="roleName">
            <el-input v-model="editRoleForm.roleName"></el-input>
          </el-form-item>
          <el-form-item label="角色描述" prop="roleDesc">
            <el-input v-model="editRoleForm.roleDesc"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="editRoleDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="editRoleInfo">确 定</el-button>
        </span>
      </el-dialog>
    </el-card>
    <!-- 分配权限操作对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed"
    >
      <!-- 树形控件 -->
      <el-tree
        :data="rightslist"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defKeys"
        ref="treeRef"
      ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 所有角色列表区域
      rolelist: [],
      // 添加角色对话框显示与隐藏
      addRoleDialogVisible: false,
      // 添加角色的数据
      addRoleForm: { roleName: '', roleDesc: '' },
      // 添加角色表单的验证规则对象
      addRoleFormRules: {
        roleName: [{ required: true, message: '请输入用户名', trigger: 'blur' }, { min: 1, max: 10, message: '角色名称的长度在1~10个字符之间', trigger: 'blur' }],
        roleDesc: [{ required: true, message: '请输入密码', trigger: 'blur' }, { min: 1, max: 15, message: '角色描述的长度在1~15个字符之间', trigger: 'blur' }]
      },
      //   控制修改角色对话框的显示与隐藏
      editRoleDialogVisible: false,
      // 查询到的角色信息对象，和修改对话框中的表单双向数据绑定
      editRoleForm: {},
      editRoleFormRules: {
        roleName: [{ required: true, message: '请输入用户名', trigger: 'blur' }, { min: 1, max: 10, message: '角色名称的长度在1~10个字符之间', trigger: 'blur' }],
        roleDesc: [{ required: true, message: '请输入密码', trigger: 'blur' }, { min: 1, max: 15, message: '角色描述的长度在1~15个字符之间', trigger: 'blur' }]
      },
      //   控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      //   所有权限的数据
      rightslist: [],
      //  树形控件的数据绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 所有角色中已将拥有的权限，默然选中的节点id值
      defKeys: [],
      // 当前角色 id
      roleId: ''

    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    //   获取所有角色数据
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        this.$messages.error('获取角色数据失败！')
      }
      // 获取成功，则把数据交个 rolelist 供页面使用
      this.rolelist = res.data
    },
    // 监听添加角色对话的关闭事件
    addRoleDialogClosed () {
      this.$refs.addRoleFormRef.resetFields()
    },
    // 点击确定按钮，添加角色
    addRole () {
      this.$refs.addRoleFormRef.validate(async valid => {
        if (!valid) return ''
        const { data: res } = await this.$http.post('roles', this.addRoleForm)
        if (res.meta.status !== 200) {
          this.$message.error('添加角色失败！')
        }
        this.$message.success('添加角色成功！')
        this.addRoleDialogVisible = false
        this.getRolesList()
      })
    },
    // 展示编辑修改角色的对话框, 现将原先数据显示
    async showEditRoleDialog (id) {
      this.editRoleDialogVisible = true
      const { data: res } = await this.$http.get('roles/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('查询角色信息失败！')
      }
      this.editRoleForm = res.data
    },
    // 监听用户修改对话框的关闭事件, 重置修改对话框的内容
    editRoleDialogClosed () {
      this.$refs.editRoleFormRef.resetFields()
    },
    // 修改角色信息并提交
    editRoleInfo () {
      this.$refs.editRoleFormRef.validate(async valid => {
        if (!valid) return ''
        const { data: res } = await this.$http.put('roles/' + this.editRoleForm.roleId, { roleName: this.editRoleForm.roleName, roleDesc: this.editRoleForm.roleDesc })
        if (res.meta.status !== 200) {
          return this.$message.error('更新角色信息失败！')
        }
        this.editRoleDialogVisible = false
        this.getRolesList()
        this.$message.success('更新角色信息成功！')
      })
    },
    // 根据ID删除对应的角色信息
    async removeRoleById (id) {
      const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(error => error)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除操作')
      }
      const { data: res } = await this.$http.delete('roles/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('删除角色失败！')
      }
      this.$message.success('删除角色成功！')
      this.getRolesList()
    },
    // 根据 id 删除对应的权限
    async removeRightById (role, rightId) {
      const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(error => error)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消了删除操作！')
      }
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败！')
      }
      //   this.getRolesList()
      // 防止页面刷新
      role.children = res.data
      this.$message.success('删除权限成功！')
    },
    // 展示分配权限对话框
    async showSetRightDialog (role) {
      // 获取并保存当前角色的 id
      this.roleId = role.id
      // 获取所有权限数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限失败！')
      }
      //   把获取到的权限数据保存到 rightslist 中
      this.rightslist = res.data
      //   递归获取三级节点的id
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下所有三级权限的 id, 并保存到 defKeys 数组中
    getLeafKeys (node, arr) {
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      })
    },
    // 监听分配权限对话框的关闭事件，关闭时清空勾选权限
    setRightDialogClosed () {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights () {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败!')
      }
      this.$message.success('分配角色成功！')
      // 刷新列表
      this.getRolesList()
      this.setRightDialogVisible = false
    }

  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>
